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Issue 5 ， 1988
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The Nowday State and Potential Development on Optical and Digital Techniques for Processing SAR data
Abstract：In this paper optical and digital techniques for processing SAR data are introduced and reviewed. Advantages and disadvantages of both optical and digital processing are compared. The nowday state of the processing techniques for SAR is discussed. There potential development for the future is also foretold in the paper.- 48
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Published：2020-08-12 -
Optical Processor for SAR
Abstract：In this paper the operation principle of the optical processor for SAR and its essential components are descrihed. This optical processor is developed by Changchun Institute of Optics and Fine Mechanics. The advanced techniques used for the processor are discussed briefly.- 52
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Published：2020-08-12 -
Optical System of Processor for SAR
Abstract：The basic principle and some characters of optical processor for synthetic aperture radar(SAR)are dealt with in this paper. The emphasis in the paper is put on optical system of the processor. Design methods of the optical system are given and some noteworthy problems in the design are also considered in the paper.- 34
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Published：2020-08-12 -
Electronic Control and Display Systems in The Optical Processor of Sythesis Aperture Radar(SAR)
Abstract：The electronic control and display systems used in the optical processor of SAR will mainly be discussed in this paper. The film tension control system which is a position control system with automatic gain control(AGC)can control the film tension variation under 10g. The film velocity control system consists of two set of synchronous phase-lock velocity control systems driven by a same pulse generator in order to ensure the track error under 0.5% between the data film transporter and the image film transporter. Using linear CCD and image frame storage makes the optical processor have capability of high speed image display, Application of acoustic-optical modulator(AOM)can make the output intensity of laser beam be stable under 2%. In addition, there is electromechanically focussing capability in the processor. Decoding of additional information on SAR data film, the useful information can be obtained and recorded on image film.- 34
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Published：2020-08-12 -
The Design of Film Transport for SAR Optical Processor
Abstract：In this paper the design of 4 channels film transport for SAR optical processor is described, major performances of this transport are introduced, some influential factors on image resolution are analyzed.- 23
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Published：2020-08-12 -
The Film Velocity and Tension Control Systems
Abstract：The optical processor of SAR requires a set of precise control system for the film transport to obtain high dynamic resolution. The control system ensures a stabibized and synchronous motion of the data film and image film. We have developed a film velocity and tension control system, which controls film velocity using phase-lock loop with the complex control, and drives two set of film transport with a high stabilized pluse generator, so that the tracking error between the data film velocity and image film velocity is less than 0.3%. The film tension control system, which uses position sensor of opto-electric potentiometer, makes the variance of tension in full velocity range less than 6.8g. This paper describes the operation principle, main performance and measured results of the control system.- 29
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Published：2020-08-12 -
CCD Storage and Display System
Abstract：This paper describes a CCD storage and display system added to the optical processor of a systhetic aperture radar. A linear array charge-coupled device is used in the system. After the output signals of moving image samples are transformed from analogue to digits, they are written into the storage line by line during the back stroke of line synchronization; the data are read out during the forward stroke. Through the false color coding and D/A transform, rolling false color images are displayed on the color monitor. Apart from observing images by this system, it also provides convenient couditions for further digital image processing.- 29
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Published：2020-08-12 -
A Laser Intensity-Stabilizing System with an AOM
Abstract：This paper describes a system for stabilizing the output light intensity of the laser used for a SAR optical processor, in which AOM is used as the passive light intensity-stabilizing device. The working principle and testing results are also given.- 54
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Published：2020-08-12 -
Development of Cylindrical Lenses for the Synthetic-Aperture Radar
Abstract：The development of cylindrical lenses used in the optical processor for the composite aperture redar, as well as the key points of the methods and operation for processing large aperture, high precision cylindrical lenses made of erodible optical materials are deseribed in this paper.- 34
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Published：2020-08-12 -
Inspection of Function and Imaging Quality of an Optical Synthetic Aperture Radar Processor
Abstract：An Optical Synthetic Aperture Radar Prccessor(OSARP)is different from the conventional imaging system. It warks after Synthetic Aperture Radar(SAR)and processes image from SAR data film. Thus we inspect not only the imaging quality of the OSARP, but also the function of it. In this paper we provide a method of inspection of an OSARP. The function of the OSARP is obtained through testing the adjustable quantities of each assembly of the OSARP. The imaging quality of the OSARP is inspected with the general testing targets and a shift lens. We use simulated SAR data films to demonstrate the capability of the OSARP to handle radar phase histories. Finaly the true SAR data film is processed to show the comprehensive imaging quality of the SAR and the OSARP. We inspect the OSARP made in Changchun Institute of Osptics and Fine Mechanics, Academia Sinica with this method. The experimental results show that the method is practical.- 38
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Published：2020-08-12 -
A New Method of Optical Simulating SAR Date Films
Abstract：This paper describes an oplical system simulating data films of Synthetic Aperture Radar. It can obtains an arbitrary length of azimuth focus. The system has considerable flexibility and adaptability as well as good simulation precision. This system can be operated in a smaller laboratory. The feasibility of this system has been proved out in pracitce.- 29
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Published：2020-08-12 -
URA Coded Aperture and Computer Reconstruction for Coded Image
Abstract：This paper discusses an approach to design coded aperture and computer reconstruction method of coded image. The coded aperture of uniformly redundant array(URA)consisting of m-sequence is used. In decoded processing completed by microcomputer, we use the balanced correlation method with fine sampling and the fast Hadamar transform. They have successfully applied to X-ray imaging aud processing.- 34
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Published：2020-08-12 -
Reconstruetion Optical of Eoded Aperture Imaging of Sort-Ray with Uniformly Redundant Arrays(URA)
Abstract：The URA coded operture imaging technique is briefly introduced. The emphasis is on optical processing method of superpused images obtained by the URA camera. Experimental and practical rasults are given. Analysis and assessment on image quality are presented in the paper.- 41
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Published：2020-08-12 -
The Programming of Auto-Recovery Misdeleted Files of Disk on IBM PC Computer
Abstract：This paper introduces a method for programming of autorecovery misdeleted files of disk on IBM PC computer.- 34
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Published：2020-08-12
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